def add(a,b):
    print(f"ADDING {a} + {b}")
    return a + b

def subtract(a,b):
    print(f"SUBTRACTING {a} - {b}")
    return a - b

def multiply(a,b):
    print(f"MULTIPLYING {a} * {b}")
    return a * b

def divide(a,b):
    print(f"DIVIDING {a} / {b}")
    return a / b

print("Let's do some math with just functions!")
age = add(30,5)
height = subtract(78,4)
weight = multiply(90,2)
iq = divide(100,2)
print(f"Age: {age} ,Height: {height}, Weight: {weight}, Iq: {iq}")

print("Here is a puzzle.")
what = add(age, subtract(height, multiply(weight, divide(iq,2))))
print("That becomes:", what, "Can you do it by hand?")
